Drying and heating apparatus.



T. COLEMAN, A. COLEMAN T. COLEMAN, IR. & F. COLEMAN.

DRYING AND HEATING APPARATUS.

APPLICATION FILED JUNE'II, I9I4. V

Patent-ed June 29, 1910.

2 $HEETS-SHEET I.

T. COLEMAN, A. COLEMAN APPUCATION FILED JUNE 1 l 19'4. I Llfifl. Patented June 29, 1915.

2 SHEETSSHEET 2 pn irnp earns PATENT opinion.

rnOnAs OLEMA ALFRED COLEMAN, THOMAS cOLEMAN. an; AND FRA K COLEMAN, I

or DERBY, ENGLAND.

DRYING AND HEATING APrAnA'rUs.

Specification of Letters Patent. Patented June 29, 1915.

Application filed June 11, 1914. Se; ".1 No. 844,596.

' preparing them for use in forming or. re

stood from the drawings pairing roads and the like. In'the treatment of such materials for this purpose ve dry and heat the materials in an. apparatus which is the subject of the present improvement to remove any moisture and impart the requisite degree of heat to enable the material to be mixed with a binding-material such as bitumen, asphalt, tar or the like. The resulting material is adapted for forming a durable and dustless road and theapparatus for its treatment should preferably be portable to enable the treatment to be carried on at the site where. the road construction or repair is to be carried out.

The features-of novelty will be pointed out in the appended claims and the construction and operationof a convenient embodim'ent of the improvement will be underand following description.

Figure .1 is a general sectional view of the apparatus. f Fig. 2 is a sectional view of the upper part of same at right angles to Fig. 1. In this embodiment the material to be treated is charged from a hopper a or in any convenient manner onto a plate I) or disk member which is arranged for rotation. The disk or plate member is curved up- .wardly toward its perimeter. 'It is preferred to employ a flat center part a'for the disk with the part toward the edge or rim ofthe disk curved upwardly as at d.

The member disk Z2 is mounted within a, suitable casing c to which hot gases from a furnace or heated air is led in any suitable manner, such as through the opening 7". The disk is rotated and the material isflfed onto it and progresses toward the perimeter which, owing to its curved up formation, retains the material on the disk under the influence of heat for a longer period than would be the case with a plain disk.

It is preferred particularly when treating stone or materials in. which the component pieces are relatively large to surround the disk with an inverted cone g, which receives material falling from Or thrown off the disk, which we prefer shall load to a second disk It o'nthe same driving spindleand this may be similarly equipped with a cone 2' or other receiving surface leading if desired to a further disk j. Anyconvenient number of the rotating disks may be thus employed; four are shown on the drawing and in the preferred construction the receiving surface from the final disk is an inclinedor conical bin or hopper k formed by the bottom of the casing itself. t o

The hot gases or heated air may be led in. near the lower part of the casing at f, and the steam and moisture driven off the material maybe carried away by an exhaust fan l arranged on the top plate of the casing. Any suitable driving arrangements may be made for instance the upper end of the drivingspindle-may be carried through the top plate and be driven by bevel gearingm froma horizontal shaft afor which suitable bearings will be provided and this shaft may be driven by chain or other means from an internal combustion engine "carried on a suitable part of the frame or from an electric motor or other means. 7 a V To prevent the material lying on the disk members-near the center where centrifugal effort is less, we may arrange afinger 0 placed in oblique position; this also serves the purpose of keeping the Opening at the bottom of the cones clear for the upward passage of the gases. The path of the gases is indicated by arrows.

.The curve of the plates or disk member is so arranged that as. it approaches the perimeter of the disk where the centrifugal effort will be much greater, the resistance increases so as to retain the material from being thrown straiglitway from the disk; As more material is fed onto the member however and travels rapidly over the fiat part of the disk it thrusts upon the material retained by the curve and the latter is thrown off and impinges against the fixed cones 9' falling down the hot surface Of same in a separated condition, the action is repeated.

on the next disk and an effective and rapid drying and heating of the material is ob tained.

The.speed of the rotary members will naturally be suited to the materials to be treated; we find with an apparatus employing disks five feet in diameter that 40 revolutions per minute is a satisfactory speed for broken stone increasing to 60 or 70 for sand.

WVhat we claim then is: i 1.- In an'apparatus for'drying and heating roadmaking materials, such as stone and sand, a casing including at the top means for introducing the material to be heated and means for admitting heated gases at the bottom, said casing being provided with a series of'superposed inverted conical walls forming communicating receiving chambers, a rotatable disk member in each chamher for receiving successively .the material from said walls, each disk having a flat central portion and an upturned peripheral discharge edge to retard the passage of the 'material over the edge during the rotation thereof, the conical wall subjacent the initial intake disk and delivering to the neXt lower disk having an inclination greater than the conical walls SubJacent thereto for insuring an initial downward movement of the matebetween said disks and having discharge ends projecting below the upturned'edges of said disks and discharging inwardly of the periphery thereof, whereby the heated gases are caused to successively pass over the under surface of each disk to heat the lower strata of material therein, and are deflected charge ends.

by the said conical walls onto thematerial carried by said disks; thereby heating the upper strata of material and passingthrouglr' the latter and upwardly through said dis- 3.'-In a drying and heating apparatus, a casing including means for feeding the materialto be heated into the top and means for admitting heated gases at the bottom, superposedrotatable receiving disks in said casing havingupturned peripheral discharging edges, comcal receivlng, walls 1n said ca'smg between said disks having discharge ends projecting below the upturned discharge "edges of said disks and inwardly of the periphery thereof, the discharge end of each -wall being raised above its respective disk a successively lncreasing d stance inversely to the direction of flow of the heated gases whereby the material in the lower disk is subjected to a greater amount of heat than v the material in the next preceding disk.

4. Ina drying and heating apparatus, a casing including means for feeding the material-tobe heated into the top, and means foradm'itting heated gases at the bottom there of, a rotatable materlal receiving disk in SHId'CIISIIIg having an upturned perlpheral discharge edge, and a delivery wall having its discharge end projecting inwardly from the periphery of the disk and below the peripheral discharge edge thereof, substantially as described. a

In testimony whereof, we have signed our names to this specification in the presence of two subscribing witnesses.

THOMAS COLEMAN ALFRED COLEMAN. THOMAS COLEMAN, JUNK. FRANK COLEMAN.

Witnesses:

L. DAWSON HARDcAs'rLE, S. WHEEN.

Copies ofthis patent may be obtained for five cents each, by addressing the Commissioner! of 2mm,

' Washington, D. 0, v 

